Current File : //usr/include/mysql/server/private/create_tmp_table.h
#ifndef CREATE_TMP_TABLE_INCLUDED
#define CREATE_TMP_TABLE_INCLUDED
/* Copyright (c) 2021, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/*
Class for creating internal tempory tables in sql_select.cc
*/
class Create_tmp_table: public Data_type_statistics
{
protected:
// The following members are initialized only in start()
Field **m_from_field, **m_default_field;
KEY_PART_INFO *m_key_part_info;
uchar *m_group_buff, *m_bitmaps;
// The following members are initialized in ctor
uint m_alloced_field_count;
bool m_using_unique_constraint;
uint m_temp_pool_slot;
ORDER *m_group;
bool m_distinct;
bool m_save_sum_fields;
bool m_with_cycle;
ulonglong m_select_options;
ha_rows m_rows_limit;
uint m_group_null_items;
// counter for distinct/other fields
uint m_field_count[2];
// counter for distinct/other fields which can be NULL
uint m_null_count[2];
// counter for distinct/other blob fields
uint m_blobs_count[2];
// counter for "tails" of bit fields which do not fit in a byte
uint m_uneven_bit[2];
public:
enum counter {distinct, other};
/*
shows which field we are processing: distinct/other (set in processing
cycles)
*/
counter current_counter;
Create_tmp_table(ORDER *group, bool distinct, bool save_sum_fields,
ulonglong select_options, ha_rows rows_limit);
virtual ~Create_tmp_table() {}
virtual bool choose_engine(THD *thd, TABLE *table, TMP_TABLE_PARAM *param);
void add_field(TABLE *table, Field *field, uint fieldnr,
bool force_not_null_cols);
TABLE *start(THD *thd,
TMP_TABLE_PARAM *param,
const LEX_CSTRING *table_alias);
bool add_fields(THD *thd, TABLE *table,
TMP_TABLE_PARAM *param, List<Item> &fields);
bool add_schema_fields(THD *thd, TABLE *table,
TMP_TABLE_PARAM *param,
const ST_SCHEMA_TABLE &schema_table);
bool finalize(THD *thd, TABLE *table, TMP_TABLE_PARAM *param,
bool do_not_open, bool keep_row_order);
void cleanup_on_failure(THD *thd, TABLE *table);
};
#endif /* CREATE_TMP_TABLE_INCLUDED */
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